Oil service reset Chevrolet GMC Trucks Envoy/Trailblazer

2004-2009

Turn the ignition to run (one position before starting engine).
Immediately after Step 1 press and release the gas pedal 3 times within 5 seconds.
If the Change Oil Soon light flashes the system is resetting.
Turn the ignition off and then start the engine to verify the indicator has been reset.